Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c24a2ab99eff0398d1f634a4a25fe69e97d749d87bd298cca8b39cbd53ad1b' 
  AND token = '1rN2YHkvHMSDEzY0yLVxrtw0RUjNydbIPD6DrW1CBLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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