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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf55bbfde0745c7f07cd7f97dc73304361d518bb73dd1809b08c20fc29a22297' 
  AND token = 'LPfcHm2LYt2ncLW4Lwt/poTaNrDZL9SRFq089aVe9f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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