SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700de5c26f10484e3157caf66a942fb41c51e18ababe91337cd3968346a4fdac' 
  AND token = 'iiBGUtR3+UX+LimWJSZjH/L+KSkEBEZCGXZwq+tbPSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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