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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2608c8a542d2c0478f5157083d519446f34fa8e9f029eee24e746dc75606a09b' 
  AND token = 'RL7rZLXt8NTgivS0OQIgQPJ1H2uhNvE2tqKNc9SCC2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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