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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef6503ef47fcd11f9f82339d7aa95e6f8789b88e65695b2ebe26417670c9308' 
  AND token = 'dktBWJOdRCsMbBH5sqDQRxFt1O87zdz8x12MVpCOgSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}