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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324bd4f0af497d6e489ece1013667e45fcd8ec3a410fb722b4c0551c990f56d2' 
  AND token = 'VqVFWG9Rnvzm+4Yn0Ua6930sOA2hwq273alb4Q7bfGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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