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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821c8565e46ec667ae25bd1fb7f42272abcd71779ac565469a4783e621a83f20' 
  AND token = 'S1cd5ka2xIPB1KXmzEXI4p4pJdejFm65a+Gi+99I0T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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