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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5263ae598200ae8338b8a2232e41c4b0ea390ad336358d4758f56c6e3c60aa3e' 
  AND token = 'hn2V8hc565lh7gGoXY0hItiGq4g6If0OjVwLgRje+TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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