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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ece438fef87644a0576c9c31949979706f2e6bbf216cf2c3e5cd1ec5f94714' 
  AND token = '6wzVWM+aUn1u7xRLd3vH36a5+7UFIFkDRUN81vBl5uA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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