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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a578636a7bde826d23d2cdc3841babfbf586a6d28c849e507fac1af5cc0b97f' 
  AND token = 'nniWFOtjK7lnOiDMqDjXHbb8bCnxi9gGM3YybEBK2jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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