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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2efb84b48f390886747632bc08085ffabdb31bfa99aa73a085479a2b07c1b54' 
  AND token = 'qPSaX+X0iXg5VIrECHZ0k7BhB1BKzSrxQSNZqkHdOfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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