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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5189b2ac2706e100fca5d1668991bfec0b53a92b8b416f08f413ddb3e8ee95' 
  AND token = '8XqLNzc4qUJnzrboA2Qhndlb9MTrMYHbi6B7qlfLnDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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