SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862d13d422985a3a45a27a3567653769a9e7a7439a109f899a5df14fb47517ce' 
  AND token = '5ALoXBhVyleG6dYfAfrnwgLsziUbjZZDxV1IVsmne5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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