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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72523cd7248ebca70a14dad400637f894cd4e9476893f57f006c730fb36e358' 
  AND token = 'Qyl2SJQdygP8G6jPG0r21vIg16tyUj6AlWje8/kJxsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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