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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d32582acabd087dad2b37a5289655b2c26a605feaf4c9aefa7aa59fa8bbdcc' 
  AND token = 'yxtDG5U6W5VqQ4CK9NN+cL8ZxiRU1jZrcBwfvF3W0I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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