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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9577c9493ec0daebbe69f34217350870249eb335610356bc5930d2ad3511a087' 
  AND token = '0ubXgWX7EOc2JZ/BTWg9DMFMZjP3nXlg1pAI1oGN0q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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