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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec7937a6a6b139e5636a70d775083187610dc76f4b742f39241705be8e72d86' 
  AND token = 'g6lccE+It2UgbHG5m382ZN1cJNwgPROJ/rroPCsAFlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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