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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283b04e6e688e22ddad835b36641a63dd414d2b97ffa83a575dfc6d3720c0c92' 
  AND token = 'iTp3oWBGoWjAB8/LxvSs1TkQROJ8z1r/VIIfRu/O6cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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