SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6037c39c17921c70fdbc273ed7b24c76ba9b6f62bbbc21fafb7169384f5666e' 
  AND token = 'sv8fdz8Z59rhRTfKnuq/LYEherUJrHJZrCPueFfGr+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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