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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9e057ddf2d1a54f138495a96bc51481392f76e1b0f3179a35d63f7f7596063' 
  AND token = '5cPI2szCrZuCl6ZvySzWARLfoGTtQoaj7BZV2Z756e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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