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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a129fd5377ec5b1d4a9776bb63718aa7437e22d7bc4ac037f4d35bbd1eac4ee' 
  AND token = 'GqhA5KmOSX1showoS5j1bbqATTEitdDRYVzM+gLYGHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00159

JSON explain

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