Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541e48897ca56ba020280827773eed4100a132773275cc2cb53bf8d8ab2a47c2' 
  AND token = 'LVnJ5xBipKbEcjlU2XY+gPQVDPFMis+mzaV0bjlxM6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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