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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32396c7dfa8a72392bb29564d1e549a6b32612a303d59a581164d265a9dcfe34' 
  AND token = '061s3ZKrYNVA8LsER7FpmERPznzvEK5gzAyFiFvA1RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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