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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1076f3b523c17d0b47234c2b2b652aea5c8fffb6f5460144cb4ceeab231d0b31' 
  AND token = 'C0Hi10ISiwuzlawmoiGa0lxvAM78xbvt8StU+CyktC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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