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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42d1ca1e3ca4b43e11b755e3578f4f4282ab02f89ef9e0ae27c49c0a691dd31' 
  AND token = 'NVUo2kHKo8WABQuepQWGvhizkHh52iidFvMv5VJ6z/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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