Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec9786abbc7b4819274125554a6854b83993f8e905f7fccee10aa68db7f4915' 
  AND token = 'rM5pinxBXEBcPuNSfPbaM4xvt3+AeD020U4noEjkcdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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