SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c1fe2c2e28799019837787ea3712f38550c8b4404c7928de37ff220313cb4e' 
  AND token = 'RAETvZ/JW49/h/qDjbWhsq9vIvGSukwhQXC+rHDIE6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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