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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9aa0d57517aa712bfd3e6e0aff56d414b6b9316f6c062edb74b147eaca802c' 
  AND token = 'EcvMV6+CDVB1dvrFY0D08dUM7t0EFlN3Rx2JmSt6n1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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