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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a933b6c112970fbdc316b2cfdcb227567f1a24bef8f97e0ca1cce67af4577e93' 
  AND token = 'APbFz3Sf2ExfqqPGi8F/eXP9Z6HQkELANYJHefD6/KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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