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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefe50d349188c66286818448bf5ff2be6ec70a6a98a8da6749d38f741fbe305' 
  AND token = 'rWnf5xcjHK5E4kq67ePzhW+DLRxfSlo0Q5QWAZm0joE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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