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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a0433c1b30544cf401d82575ead1b9b2243c5e5e95bfcb372ac842d8466ba7' 
  AND token = 'L36jLsKA+/3raMnDSRsMSrw5O7LBA7F5mIhxAbyzQWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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