SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00e4260327b27143b55227d249e190124c2ec7a0f44d4d665c4ade9a9bd71fd5' 
  AND token = 'yvQGJYLCwnHUk4ok7FaAztDBluh/s8B+RsyvBhIt/Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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