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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dc254e9b59b7bb412f9a3d380b17de4fa2ab2efc46602c0bb7cbe3557534e5' 
  AND token = 'aKKEZTYv7Heug4MnTNNj6UAVOIuPXTAcsbJBLtcGU1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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