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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8da963815559887b513fc7ce63ad308959ccaab24c52650a55708a3b0206c565' 
  AND token = 'rESRgM+ktQA75F/TJkLGJQE2LS4TXKe70TfSY7gdj+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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