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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052b3aaf35e40c27df75d116b821d52d114f7f30d822856b023bd1ea4689a3a1' 
  AND token = 'VWvkLSbQsAJuMNp9gtWx4I6VItDuxlOd6sDn0xfMYL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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