SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c72bc16717b2b76e114e3aa4f08c39db80d665ba19dd04f188345ef1b94ffe5' 
  AND token = '9OoKawSQVbkSRapIzEq+kmqzi4gGCoCx24AHupSSXrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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