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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae032930af30f26292c9d6a3abf0542165f1c72f98a169247900fc28be7f046b' 
  AND token = 'dNZZQaeJCSaLS0N7kdZEoGu5UO6nYkGQE8NHOSTZ1dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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