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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '427c345dc4ea46b8991048ff7683313f91a953f486fc3dd83e18d4000ca5ab15' 
  AND token = 'CfQ68JueThnKOnr2S5BLcQyHSOyIwwkGctj9Spqp89k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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