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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f665a604ab8415c65bb10c8665d75ae7539d6059ce8c7da0c31defb53dc8f8' 
  AND token = 'xeZ7+e38ZTM4WDW4V7iwnk4Ffj7OkpDlO1Ib+FSJPbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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