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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f604a23895872ec53bea14dbe3b26ce4a0c06feff293bdaa146717ef1e08f8d' 
  AND token = 'gU5JsSA9ovn6/W7/+S2filUfEvIf2QJQxpzBlb3b34A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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