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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5017a346ca8fcb9b0227a3c7587bfb17df2e0df1e3897150622876efff5c58f' 
  AND token = 'zrpSduVLc+i5XjrI7fPcJN6/cMJjJ8wLf4ux9z++CaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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