SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065d5f671511b65546c699731eeee926b0a4d6a7521066f389476dc8ccd72455' 
  AND token = 'nlKEjUT6kj/JwprzVkI8zST0J7VfgCCrDxCK/ZuLR2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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