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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f03c3d2ccb5981b56437b594b1567895812a939f7c395ee7442bbd784adf5c' 
  AND token = '9xoYVQkjT59UocOfyLYxBOaBAJr5eTvK02T4Aluoo1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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