SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73767955ed09a0f179c853e1be8da75c8ddf4f9999f63790b54b186a4b6b1994' 
  AND token = 'hgKC6Bth2hKQy1DYHUdu2KSkJQTZEtwtKjcLe3q+97M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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