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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb98a301a00a8b23181e7468893e0736dde084dd4e0eb293ffecf9bc5d2b73ad' 
  AND token = 'l0Mji7aE3kMJu4Lq/5+UE1SNXaJ1V+9/xYE7C75XvcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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