SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fdc8d84952dd626bc836b361f8592347677816a0c239b7fe23080649fd85c32' 
  AND token = 'L1PZ614XQ/7HKBQjhctJwPBYbw1/GKQYDjipzQds3v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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