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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a055fe58b0ca62a42615580df4d23d2e35639e4ba08291a9defc0704c762733d' 
  AND token = '2VuDdE0SvxAtRz62PQOrjbEWpAUdviN18fbebhZAdos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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