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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f05b27a2a1e3ff84da0d284743d20c4b6d402adf703d81e07e9a829678e92d7' 
  AND token = 'CJGqBZcDE3oPbJcdu2E7LitYeaJbv3dBUXyvA0eoBnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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