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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67350889ce165f9467f1cae7aa24ab76a39d253b75ffc024eefa0b4ff28bc8ec' 
  AND token = 'bhXJbOuNWZY/nDhwAkO/9T8fJ/mx//gsKLn5B/8QZE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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