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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3f08c0fe6c88934e9051e25c2f9d4431a6cabe6731a3a6956f5f61ef4bf395f' 
  AND token = 'M+JB6J4kXjFSbjDD5jokxJOOpflf+Cd2mIgmj0iOjBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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