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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107ebebc06c32f9b10f6ac889e8ae2ee6405416977fcdcc862c170b79691c995' 
  AND token = '3I0YLWDIKanOeVP/oQPi1wiQLGKALSi68qtyaj4LElo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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