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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877d36a2838971c0e3edd497e4dfc20231d70b27c312833f3bfb8db31fd5cf9f' 
  AND token = '/DL4HTKQ0cSlTs0KBQnBA+RKCjYEA8qYio4Km3HDmm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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