SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aaf233b31a3ee1179f35c79f04f4ef92583910b81ff81699506f81f8376d646' 
  AND token = 'FGKBjDMzVE0Y7NEizt47hKPQ5KsPKBtJxWfBoeGCzQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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