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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba78d2b247d85d9a3af2050cd58cf6fa59f72fda8e8ffbed23fd73d5c34d2ba2' 
  AND token = '7070xcb6zJkHkYkbiqzi3TKzfk613DmZbuoglXvg+S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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