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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd28c954bb69702108d0b9c20a71033b0505e7ff275f809cfb67c4e07bebf1e' 
  AND token = 'WlwCJaHhNxUSCW54ynjeQjpi3gXBqp03qBXCoG0PQbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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