Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a50104ed91b8cd239615d1cf5a874ee7f3d3aa04a380fa7c36e018ac74cb01' 
  AND token = 'vKaFVvIlk/Vbx68OkeRJSEVrbdAgYjrtCqXkJIo0wQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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