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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd54e140deb5d2cd921a437bcfd2da29f4215af56f6ac170419f751539107b3af' 
  AND token = 'O5f0IZGPN5kyaabGT72ZsQzqgagZki0rHzh4qFdxQbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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