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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7839bb6de64dccf4547138bce93a355faeaf27d1e27e255ded1ad41564b5c8' 
  AND token = 'nzwTl6SDHr47aqhpzTnmLucAK39d9jKmXKrrN4N3Neo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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