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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8ea089eaf15f12b992b2722c8abadda8312ceb20874a6754a97f8b92695578' 
  AND token = '7D6P4djK02uO/P5F2QaiMU5A8FJMGWfmgdJw8U3zJSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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