SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa58207d05cdef0dc847d5b080b1ce4ac19b69616ff530e249c44d697a763077' 
  AND token = '/R33OLm0lvpZE9vnr1oSVaACh+5QzUJSrojibjPQ6ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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