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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216695c078f5c94e5b173b7015c1172bbd6b08cb592089c151bb2e1074edf71c' 
  AND token = 'hIYJhUhQaOMqobHqWqFIIg0mrZ/iFv3rO/KNLH7ar8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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